> when you say remove the device, I assume you mean simply make it unavailable
> for import (I can't remove it from the vdev).

Yes, that's what I meant.

> root@openindiana-01:/mnt# zpool import -d /dev/lofi
>  pool: ZP-8T-RZ1-01
>    id: 9952605666247778346
>  state: FAULTED
> status: One or more devices are missing from the system.
> action: The pool cannot be imported. Attach the missing
>        devices and try again.
>   see: http://www.sun.com/msg/ZFS-8000-3C
> config:
>        ZP-8T-RZ1-01              FAULTED  corrupted data
>          raidz1-0                DEGRADED
>            12339070507640025002  UNAVAIL  cannot open
>            /dev/lofi/5           ONLINE
>            /dev/lofi/4           ONLINE
>            /dev/lofi/3           ONLINE
>            /dev/lofi/1           ONLINE
> It's interesting that even though 4 of the 5 disks are available, it still
> can import it as DEGRADED.

I agree that it's "interesting". Now someone really knowledgable will
need to have a look at this. I can only imagine that somehow the
devices contain data from different points in time, and that it's too
far apart for the aggressive txg rollback that was added in PSARC
2009/479. Btw, did you try that? Try: zpool import -d /dev/lofi -FVX
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